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PICAXE Chips - PICAXE PICAXE-28X1, PICAXE Chip, PICAXE Family, 4V to 5.5V Supply Voltage, 128Bytes Flash Memory, 22 I/O Pins, 4 ADC Channels, 2 PWM Channels, 16MHz Clock Speed, I2C Interfaces, 28-DIP Case, Advanced Level PICAXE Chip, Program Memory 600 Line, Separate data memory, Interrupts, Infra-red Receive, support SOR Digital Temperature Sensor, Control of Radio-control Servos, Keyboard Input, I2C Interface for Linking to External EEPROMs and other Devices, 8/10-Bit ADC, 12-Bit Temperature Read, PWM Motor Control, Input Pulse Counting, Serial Output via Programming Cable, Higher Baud Rate for Serial Work PICAXE-28x1 Chip